Acetal

Acetal is Widely Used For:

  • Bearings and bushings
  • Pump and valve parts
  • Manifolds
  • Gears
  • Jigs and fixtures
  • Food processing and other
    packaging machinery parts
  • Wear pads
  • Electrical components

Performance Characteristics:

  • Strong and stiff
  • Excellent machinability
  • Low moisture absorption
  • Excellent wear properties in both
    wet and dry environments
  • Low friction
  • Good chemical resistance

Common Brands:

  • Delrin®
  • SUSTARIN®
  • TECAFORM®


Acetal

High strength, stiff, low friction engineering plastic with good wear properties

Acetal (polyoxymethylene) is a high strength, low friction engineering plastic that has excellent wear properties in both wet and dry environments. Easy to machine, acetal makes an outstanding choice for applications that require complex, tight tolerances.

Shop for Acetal

 

STANDARD SIZES
SHEET Dimensions:
6 in x 12 in – 48 in x 120 in
Thickness:
0.125 in – 6 in
ROD Diameter:
0.187 in – 12 in
TUBE Outside Diameter:
25 mm – 230 mm
OPTIONS AVAILABLE
COLOR Sheet and Rod:
Black, Blue, Green, Natural, Brown

Medical Grade Rod:
Dark Blue, Dark Green, Gray

Tube:
Natural
GRADES Static Dissipative, Glass-Filled, Enhanced Bearing and Wear, FDA Compliant, Medical

Length, width, thickness, and diameter tolerances vary by size, by manufacturer, brand, and grade. Custom sizes and colors available upon request.

 

ACETAL MATERIAL OPTIONS

Homopolymer vs Copolymer- Acetal is available in both homopolymer (Delrin® 150) and copolymer.

  • Homopolymer acetal (Delrin®) has superior room temperature strength, stiffness, and toughness.
  • Copolymer acetal has excellent performance in continuous high heat and hot water environments. Copolymer acetal also tends to have less porosity than homopolymer acetal. 

FDA– The virgin, natural, unfilled formulations of acetal comply with one or more of the FDA’s guidelines for direct food contact at room temperature. It is important to specify FDA compliant material at the time of the order to ensure that FDA compliant material is provided.

Acetal Grades– Acetal is available in a number of grades, including enhanced bearing and wear Delrin® AF, Delrin® 100AF blend, Delrin® AF DE588, and TECAFORM® HPV13. Delrin® 511P is a homopolymer acetal that offers enhanced crystallization characteristics. This higher level of crystallization helps to augment aspects of the physical properties such as fatigue strength, stiffness, and creep resistance.
Ask about special formulations that offer medical, metal detectable, x-ray detectable, or static dissipative grades.

Chemical Attack– Acetal is chemically resistant to many fuels and solvents.

Wear Resistance– Acetal offers good wear and abrasion properties.

Tech Tip– Glass-filled grades of acetal offer enhanced strength and stiffness such as Delrin® 570.

 

Typical properties of ACETAL
  UNITS ASTM
TEST
HOMOPOLYMER
ACETAL
COPOLYMER
ACETAL
TECAFORM®
HPV13
PTFE-FILLED
ACETAL
20% GLASS
FIBER FILLED
HOMOPOLYMER
ACETAL
Tensile strength psi D638 10,000 9,800 6,800 8,500
Flexural modulus psi D790 420,000 370,000 350,000 730,000
Izod impact (notched) ft-lbs/in
of notch
D256 1.5 1.0 0.7 0.8
Heat deflection
temperature
@ 264 psi
°F D648 257 230 244 316
Maximum continuous
service temperature
in air
°F   185 195 185 185
Water absorption
(immersion
24 hours)
% D570 0.25 0.20 0.22 0.25
Coefficient of
linear thermal
expansion
in/in/
°Fx10-5
D696 6.8 6.1 5.1 2.0 - 4.5
Coefficient of
friction (dynamic)
    0.20 0.21 0.12 0.35

Values may vary according to brand name. Please ask your Curbell Plastics representative for more specific information about an individual brand.